<div dir="ltr">Thanks Dr. Sanjeev for the useful link</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Mar 6, 2014 at 10:28 AM, Sanjeev Gupta <span dir="ltr"><<a href="mailto:physics.skgupta@gmail.com" target="_blank">physics.skgupta@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div><div><div>Hi<br><br></div>For bulk modulus, energy Vs lattice const., is always welcome. <br>
</div>Otherway, there are lot of discussions on PWSCF forum, as one of by Prof. Eduardo Menendez.<br>
<br><br><a href="http://exciting.wdfiles.com/local--files/lithium-energy-vs-strain-calculations/elastic-paper.pdf" target="_blank">http://exciting.wdfiles.com/local--files/lithium-energy-vs-strain-calculations/elastic-paper.pdf</a><br>
</div>
and <a href="http://exciting-code.org/elastic" target="_blank">http://exciting-code.org/elastic</a><br><br></div>download it take espresso i/o files.<br><br></div>enjoy the day!<br><br></div>bests<br>sanjeev<br></div><div class="gmail_extra">
<br><br><div class="gmail_quote"><div><div class="h5">On Thu, Mar 6, 2014 at 9:32 AM, vicky singh <span dir="ltr"><<a href="mailto:kirtinandan07@gmail.com" target="_blank">kirtinandan07@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">
<div dir="ltr">Dear QE users<div> I am calculating the bulk modulus using the ev.x executable. The bulk modulus obtained is extremely sensitive to the number of data i use in the lattice parameter vs energy table. if i use three values a-x, a, a+x, where a is the equilibrium lattice parameter and x is 0.01 or 0.02 bohr the value of bulk modulus is very high as compared to i use 5 or 10 data. Bulk modulus is the double derivative if energy w.r.t. equilibrium lattice parameter.</div>
<div> What should be the best method to obtain the bulk modulus of the system. Also if you can provide any tutorial or help to calculate other elastic constant it will be extremely helpful.</div><span><font color="#888888"><div>
<br></div><div>Vicky Singh</div>
<div>RA, Bangalore</div></font></span></div>
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<br clear="all"><br>-- <br><div><span style="font-size:13px;font-family:Tahoma">With Best Regards,</span></div>
<div><span style="font-size:13px;font-family:Tahoma"><br></span></div><div><span style="font-size:13px;font-family:Tahoma">------------------------------</span><span style="font-size:13px;font-family:Tahoma">------</span></div>
<div><div style="font-family:Tahoma;font-size:13px"><div style="font-size:13px"><div style="font-size:13px">Dr. Sanjeev Kumar Gupta<br>Fulbright Post-Doctoral Scholar<br>Dept. of Physics<br><span style="line-height:19.49652862548828px;text-align:justify;color:rgb(68,68,68);font-family:'Trebuchet MS',Geneva,sans-serif">Michigan Technological University </span><br>
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